1 | /* |
1 | /* |
2 | * libecb - http://software.schmorp.de/pkg/libecb |
2 | * libecb - http://software.schmorp.de/pkg/libecb |
3 | * |
3 | * |
4 | * Copyright (©) 2009-2011 Marc Alexander Lehmann |
4 | * Copyright (©) 2009-2011 Marc Alexander Lehmann <libecb@schmorp.de> |
5 | * Copyright (©) 2011 Emanuele Giaquinta |
5 | * Copyright (©) 2011 Emanuele Giaquinta |
6 | * All rights reserved. |
6 | * All rights reserved. |
7 | * |
7 | * |
8 | * Redistribution and use in source and binary forms, with or without modifica- |
8 | * Redistribution and use in source and binary forms, with or without modifica- |
9 | * tion, are permitted provided that the following conditions are met: |
9 | * tion, are permitted provided that the following conditions are met: |
… | |
… | |
38 | * or so. |
38 | * or so. |
39 | * we try to detect these and simply assume they are not gcc - if they have |
39 | * we try to detect these and simply assume they are not gcc - if they have |
40 | * an issue with that they should have done it right in the first place. |
40 | * an issue with that they should have done it right in the first place. |
41 | */ |
41 | */ |
42 | #ifndef ECB_GCC_VERSION |
42 | #ifndef ECB_GCC_VERSION |
43 | # if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) |
43 | #if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) |
44 | # define ECB_GCC_VERSION(major,minor) 0 |
44 | #define ECB_GCC_VERSION(major,minor) 0 |
45 | # else |
45 | #else |
46 | # define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
46 | #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
|
|
47 | #endif |
47 | # endif |
48 | #endif |
48 | #endif |
|
|
49 | |
49 | |
50 | #ifndef __cplusplus |
50 | #ifdef __cplusplus |
|
|
51 | #define ECB_INLINE static inline |
|
|
52 | #elif ECB_GCC_VERSION(2,5) |
|
|
53 | #define ECB_INLINE static __inline__ |
51 | # if __STDC_VERSION__ >= 199901L |
54 | #elif __STDC_VERSION__ >= 199901L |
52 | # define ECB_INLINE inline |
55 | #define ECB_INLINE static inline |
53 | typedef _Bool ecb_bool; |
|
|
54 | # else |
56 | #else |
55 | # define ECB_INLINE inline /* yeah! */ |
57 | #define ECB_INLINE static |
|
|
58 | #endif |
|
|
59 | |
|
|
60 | #if ECB_GCC_VERSION(3,3) |
|
|
61 | #define ecb_restrict __restrict__ |
|
|
62 | #elif __STDC_VERSION__ >= 199901L |
|
|
63 | #define ecb_restrict restrict |
|
|
64 | #else |
|
|
65 | #define ecb_restrict |
|
|
66 | #endif |
|
|
67 | |
56 | typedef int ecb_bool; |
68 | typedef int ecb_bool; |
57 | # endif |
|
|
58 | #endif |
|
|
59 | |
69 | |
60 | #define ECB_CONCAT_(a, b) a ## b |
70 | #define ECB_CONCAT_(a, b) a ## b |
61 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
71 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
62 | #define ECB_STRINGIFY_(a) # a |
72 | #define ECB_STRINGIFY_(a) # a |
63 | #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
73 | #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
64 | |
74 | |
65 | #define ECB_HEADER_INLINE static ECB_INLINE |
75 | #define ECB_HEADER_INLINE ECB_INLINE |
66 | |
76 | |
67 | #if ECB_GCC_VERSION(3,1) |
77 | #if ECB_GCC_VERSION(3,1) |
68 | # define ecb_attribute(attrlist) __attribute__(attrlist) |
78 | #define ecb_attribute(attrlist) __attribute__(attrlist) |
69 | # define ecb_is_constant(expr) __builtin_constant_p (expr) |
79 | #define ecb_is_constant(expr) __builtin_constant_p (expr) |
70 | # define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
80 | #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
71 | # define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
81 | #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
72 | #else |
82 | #else |
73 | # define ecb_attribute(attrlist) |
83 | #define ecb_attribute(attrlist) |
74 | # define ecb_is_constant(expr) 0 |
84 | #define ecb_is_constant(expr) 0 |
75 | # define ecb_expect(expr,value) (expr) |
85 | #define ecb_expect(expr,value) (expr) |
76 | # define ecb_prefetch(addr,rw,locality) |
86 | #define ecb_prefetch(addr,rw,locality) |
77 | #endif |
87 | #endif |
78 | |
88 | |
79 | /* no emulation for ecb_decltype */ |
89 | /* no emulation for ecb_decltype */ |
80 | #if ECB_GCC_VERSION(4,5) |
90 | #if ECB_GCC_VERSION(4,5) |
81 | # define ecb_decltype(x) __decltype(x) |
91 | #define ecb_decltype(x) __decltype(x) |
82 | #elif ECB_GCC_VERSION(3,0) |
92 | #elif ECB_GCC_VERSION(3,0) |
83 | # define ecb_decltype(x) typeof(x) |
93 | #define ecb_decltype(x) typeof(x) |
84 | #endif |
94 | #endif |
85 | |
95 | |
86 | #define ecb_noinline ecb_attribute ((noinline)) |
96 | #define ecb_noinline ecb_attribute ((__noinline__)) |
87 | #define ecb_noreturn ecb_attribute ((noreturn)) |
97 | #define ecb_noreturn ecb_attribute ((__noreturn__)) |
88 | #define ecb_unused ecb_attribute ((unused)) |
98 | #define ecb_unused ecb_attribute ((__unused__)) |
89 | #define ecb_const ecb_attribute ((const)) |
99 | #define ecb_const ecb_attribute ((__const__)) |
90 | #define ecb_pure ecb_attribute ((pure)) |
100 | #define ecb_pure ecb_attribute ((__pure__)) |
|
|
101 | |
|
|
102 | #if ECB_GCC_VERSION(4,3) |
|
|
103 | #define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */ |
91 | #define ecb_hot ecb_attribute ((hot)) /* 4.3 */ |
104 | #define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */ |
92 | #define ecb_cold ecb_attribute ((cold)) /* 4.3 */ |
105 | #define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */ |
|
|
106 | #else |
|
|
107 | #define ecb_artificial |
|
|
108 | #define ecb_hot |
|
|
109 | #define ecb_cold |
|
|
110 | #endif |
93 | |
111 | |
94 | /* put into if's if you are very sure that the expression */ |
112 | /* put into if's if you are very sure that the expression */ |
95 | /* is mostly true or mosty false. note that these return */ |
113 | /* is mostly true or mostly false. note that these return */ |
96 | /* booleans, not the expression. */ |
114 | /* booleans, not the expression. */ |
97 | #define ecb_unlikely(expr) ecb_expect (!!(expr), 0) |
115 | #define ecb_expect_false(expr) ecb_expect (!!(expr), 0) |
|
|
116 | #define ecb_expect_true(expr) ecb_expect (!!(expr), 1) |
|
|
117 | /* for compatibility to the rest of the world */ |
98 | #define ecb_likely(expr) ecb_expect (!!(expr), 1) |
118 | #define ecb_likely(expr) ecb_expect_true (expr) |
|
|
119 | #define ecb_unlikely(expr) ecb_expect_false (expr) |
99 | |
120 | |
100 | /* try to tell the compiler that some condition is definitely true */ |
121 | /* try to tell the compiler that some condition is definitely true */ |
101 | #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) |
122 | #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) |
102 | |
123 | |
103 | /* count trailing zero bits and count # of one bits */ |
124 | /* count trailing zero bits and count # of one bits */ |
104 | #if ECB_GCC_VERSION(3,4) |
125 | #if ECB_GCC_VERSION(3,4) |
105 | #define ecb_ctz32 (x) __builtin_ctz (x) |
126 | #define ecb_ctz32(x) __builtin_ctz (x) |
106 | #define ecb_popcount32 (x) __builtin_popcount (x) |
127 | #define ecb_popcount32(x) __builtin_popcount (x) |
107 | #else |
128 | #else |
108 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; |
129 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; |
109 | ECB_HEADER_INLINE |
130 | ECB_HEADER_INLINE int |
110 | ecb_ctz32 (uint32_t x) |
131 | ecb_ctz32 (uint32_t x) |
111 | { |
132 | { |
112 | int r = 0; |
133 | int r = 0; |
113 | |
134 | |
114 | x &= -x; /* this isolates the lowest bit */ |
135 | x &= -x; /* this isolates the lowest bit */ |
115 | |
136 | |
116 | if (x & 0xaaaaaaaa) r += 1; |
137 | if (x & 0xaaaaaaaa) r += 1; |
117 | if (x & 0xcccccccc) r += 2; |
138 | if (x & 0xcccccccc) r += 2; |
118 | if (x & 0xf0f0f0f0) r += 4; |
139 | if (x & 0xf0f0f0f0) r += 4; |
119 | if (x & 0xff00ff00) r += 8; |
140 | if (x & 0xff00ff00) r += 8; |
120 | if (x & 0xffff0000) r += 16; |
141 | if (x & 0xffff0000) r += 16; |
121 | |
142 | |
122 | return r; |
143 | return r; |
123 | } |
144 | } |
124 | |
145 | |
125 | ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const; |
146 | ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const; |
126 | ECB_HEADER_INLINE |
147 | ECB_HEADER_INLINE int |
127 | ecb_popcount32 (uint32_t x) |
148 | ecb_popcount32 (uint32_t x) |
128 | { |
149 | { |
129 | x -= (x >> 1) & 0x55555555; |
150 | x -= (x >> 1) & 0x55555555; |
130 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
151 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
131 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
152 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
132 | x *= 0x01010101; |
153 | x *= 0x01010101; |
133 | |
154 | |
134 | return x >> 24; |
155 | return x >> 24; |
135 | } |
156 | } |
136 | #endif |
157 | #endif |
137 | |
158 | |
138 | #if ECB_GCC_VERSION(4,3) |
159 | #if ECB_GCC_VERSION(4,3) |
139 | # define ecb_bswap32(x) __builtin_bswap32 (x) |
160 | #define ecb_bswap32(x) __builtin_bswap32 (x) |
140 | # define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) |
161 | #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) |
141 | #else |
162 | #else |
142 | ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
163 | ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
143 | ECB_HEADER_INLINE uint32_t |
164 | ECB_HEADER_INLINE uint32_t |
144 | ecb_bswap32 (uint32_t x) |
165 | ecb_bswap32 (uint32_t x) |
145 | { |
166 | { |
146 | return (x >> 24) |
167 | return (x >> 24) |
147 | | ((x >> 8) & 0x0000ff00) |
168 | | ((x >> 8) & 0x0000ff00) |
148 | | ((x << 8) & 0x00ff0000) |
169 | | ((x << 8) & 0x00ff0000) |
149 | | (x << 24); |
170 | | (x << 24); |
150 | } |
171 | } |
151 | |
172 | |
152 | ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const; |
173 | ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const; |
153 | ECB_HEADER_INLINE uint32_t |
174 | ECB_HEADER_INLINE uint32_t |
154 | ecb_bswap16 (uint32_t x) |
175 | ecb_bswap16 (uint32_t x) |
155 | { |
176 | { |
156 | return ((x >> 8) & 0xff) |
177 | return ((x >> 8) & 0xff) |
157 | | ((x << 8) & 0x00ff0000) |
178 | | ((x << 8) & 0x00ff0000) |
158 | | (x << 24); |
179 | | (x << 24); |
159 | } |
180 | } |
160 | #endif |
181 | #endif |
161 | |
182 | |
162 | #if ECB_GCC_VERSION(4,5) |
183 | #if ECB_GCC_VERSION(4,5) |
163 | # define ecb_unreachable() __builtin_unreachable () |
184 | #define ecb_unreachable() __builtin_unreachable () |
164 | #else |
185 | #else |
165 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
186 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
166 | ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn; |
187 | ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn; |
167 | ECB_HEADER_INLINE void ecb_unreachable (void) { } |
188 | ECB_HEADER_INLINE void ecb_unreachable (void) { } |
168 | #endif |
189 | #endif |
169 | |
190 | |
170 | ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const; |
191 | ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const; |
171 | ECB_HEADER_INLINE unsigned char |
192 | ECB_HEADER_INLINE unsigned char |
172 | ecb_byteorder_helper (void) |
193 | ecb_byteorder_helper (void) |
… | |
… | |
178 | ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const; |
199 | ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const; |
179 | ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }; |
200 | ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }; |
180 | ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const; |
201 | ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const; |
181 | ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }; |
202 | ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }; |
182 | |
203 | |
|
|
204 | #if ECB_GCC_VERSION(3,0) |
|
|
205 | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
|
|
206 | #else |
183 | #define ecb_mod(m, n) ((m) < 0 ? ((n) - (-(m) % (n))) : ((m) % (n))) |
207 | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
|
|
208 | #endif |
184 | |
209 | |
185 | #if ecb_cplusplus_does_not_suck |
210 | #if ecb_cplusplus_does_not_suck |
186 | // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) |
211 | // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) |
187 | template<typename T, int N> |
212 | template<typename T, int N> |
188 | static inline int ecb_array_length (const T (&arr)[N]) |
213 | static inline int ecb_array_length (const T (&arr)[N]) |
189 | { |
214 | { |
190 | return N; |
215 | return N; |
191 | } |
216 | } |
192 | #else |
217 | #else |
193 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
218 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
194 | #endif |
219 | #endif |
195 | |
220 | |
196 | ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
221 | ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
197 | ECB_INLINE uint32_t |
222 | ECB_INLINE uint32_t |
198 | ecb_rotr32 (uint32_t x, unsigned int count) |
223 | ecb_rotr32 (uint32_t x, unsigned int count) |